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I plug my 99 Savanna in when it drops below -20c. I've never had a problem. (Overnite)
 

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I know I am late to the thread but I use to live in Fairbanks, AK and the truck was plugged in 24hrs. Really the only time it wasn't was when it was running. Had no problems.
 

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I left my blazer plugged in for days...no problems...
waste of electricity, but no issues...
Fleets and bus companys leave thier trucks plugged in over the weekend...Only thing I can see happening would be shortening the life of the heater.
 
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